Order	Reaction ID	Reaction
1	R00032	protocatechuic acid + oxygen → (2Z,4Z)-2-hydroxy-5-carboxymuconate-6-semialdehyde + H<sup>+</sup>
2	R00033	(2Z,4Z)-2-hydroxy-5-carboxymuconate-6-semialdehyde + H<sup>+</sup> → (2Z,4E)-2-hydroxy-6-oxohexa-2,4-dienoate + CO<sub>2</sub>
3	R00034	(2Z,4E)-2-hydroxy-6-oxohexa-2,4-dienoate + NAD<sup>+</sup> + H<sub>2</sub>O → (2Z,4E)-2-hydroxyhexa-2,4-dienedioate + NADH + 2H<sup>+</sup>
4	R00059	(2Z,4E)-2-hydroxyhexa-2,4-dienedioate → (3E)-2-oxohex-3-enedioate
5	R00060	(3E)-2-oxohex-3-enedioate + H<sup>+</sup> → (2Z)-2-hydroxypenta-2,4-dienoate + CO<sub>2</sub>
6	R00029	"(2Z)-2-hydroxypenta-
2,4-dienoate + H<sub>2</sub>O → 4-hydroxy-2-oxopentanoate"
7	R00030	4-hydroxy-2-oxopentanoate → acetaldehyde + pyruvate
8	R00031	acetaldehyde + coenzyme A + NAD<sup>+</sup> → acetyl-CoA + NADH + H<sup>+</sup>